1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
2 |
1 |
2n−1 |
1 |
2n+1 |
=
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
2n−1 |
1 |
2n+1 |
=
1 |
2 |
1 |
2n+1 |
=
1 |
2 |
2n |
2n+1 |
=
n |
2n+1 |
=
17 |
35 |
解得:n=17.
1 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
(2n−1)(2n+1) |
17 |
35 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
2 |
1 |
2n−1 |
1 |
2n+1 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
2n−1 |
1 |
2n+1 |
1 |
2 |
1 |
2n+1 |
1 |
2 |
2n |
2n+1 |
n |
2n+1 |
17 |
35 |